Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [RFC v2][PATCH 9/9] intel_idle: Add module parameter to prevent ACPI _CST from being used | Date | Tue, 10 Dec 2019 13:13:14 +0100 |
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Add a new module parameter called "no_acpi" to the intel_idle driver to allow the driver to be prevented from using ACPI _CST via kernel command line.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> --- drivers/idle/intel_idle.c | 9 +++++++++ 1 file changed, 9 insertions(+)
Index: linux-pm/drivers/idle/intel_idle.c =================================================================== --- linux-pm.orig/drivers/idle/intel_idle.c +++ linux-pm/drivers/idle/intel_idle.c @@ -1138,6 +1138,10 @@ static bool intel_idle_max_cstate_reache #ifdef CONFIG_ACPI_PROCESSOR_CSTATE #include <acpi/processor.h> +static bool no_acpi __read_mostly; +module_param(no_acpi, bool, 0444); +MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list"); + static struct acpi_processor_power acpi_state_table; /** @@ -1167,6 +1171,11 @@ static bool intel_idle_acpi_cst_extract( { unsigned int cpu; + if (no_acpi) { + pr_debug("Not allowed to use ACPI _CST\n"); + return false; + } + for_each_possible_cpu(cpu) { struct acpi_processor *pr = per_cpu(processors, cpu);
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